There are so many gems hidden in there - e.g. lycanthropy:

It seems what’s left of my human side Is slowly changing in me (Will you give in to me?) Looking at my own reflection When suddenly it changes Violently it changes (oh no) There is no turning back now You’ve woken up the demon in me

or zombiism:

I can see inside you, the sickness is rising Don’t try to deny what you feel (Will you give in to me?) It seems that all that was good has died And is decaying in me (Will you give in to me?) It seems you’re having some trouble In dealing with these changes Living with these changes (oh no)

And Eldritchian horror where instead of bring about insanity, he seems to get saner the deeper you get into the song…:

don’t hit me Why did you have to hit me like that, mommy? Don’t do it, you’re hurting me … I don’t need this shit